TLDR;
This video provides a step-by-step guide on how to blow out your sprinkler system using an air compressor to prevent damage from freezing temperatures. It covers the necessary tools, the process of manually opening each zone, and tips for ensuring all water is removed from the lines.
- Using a regular air compressor (5 horsepower 20 gallon)
- Creating a custom adapter to connect the air compressor to the sprinkler system
- Manually opening each zone valve to blow out the water
- Repeating the process to ensure all residual water is removed
- Releasing the pressure from the system
Introduction [0:00]
The video introduces the process of blowing out a sprinkler system to prevent damage from freezing temperatures. The presenter aims to provide viewers with the confidence to perform this task themselves using a regular air compressor. A 5 horsepower 20-gallon compressor is used, which is more than adequate for the job.
Preparation and Tools [0:35]
The presenter discusses the tools needed for the task, including a cring wrench to remove the main cover and a screwdriver for the release valves. It's important not to undo the release valves until the very end to maintain pressure in the system. A key component is a custom adapter, created by matching the sprinkler system's threads at a hardware store and attaching a pneumatic fitting. This adapter will connect the air compressor to the sprinkler system.
Charging the System and Opening Zones [2:05]
The air compressor is charged to 80 lbs of pressure. The presenter emphasizes that the main brain box in the garage will not be used; instead, the valves will be opened manually. The sprinkler system has six zones, and each zone is manually opened by twisting the tops of the valves.
Blowing Out the Zones [3:57]
The presenter demonstrates how to manually open each zone by twisting the valve. The water is blown out of the lines until the pressure in the tank runs low. If the pressure drops too quickly, the zone is temporarily shut off to allow the pressure to build up again. This process is repeated two to three times per zone to ensure all water is removed.
Addressing Concerns and Additional Tips [5:55]
The presenter addresses the concern of using too much pressure, stating that while it's possible to damage the system, he has never had issues at 80 lbs. Given that the system involves pushing water uphill, maintaining adequate pressure is important. The presenter also advises letting the air compressor rest periodically to prevent it from overheating.
Second Pass and Final Steps [7:50]
As a precautionary measure, the presenter goes through all six zones a second time. This is because water can pool in low spots after the initial blow-out. Even if a zone initially blew out only air, residual water may still be present. After the second pass, the presenter opens two petcock valves to release any remaining air pressure from the system.
Closing the System [9:14]
To close the system, the custom adapter is removed, and the original cover is replaced. The presenter emphasizes that while this process is straightforward, a professional should be consulted if there are any doubts. By following these steps, the sprinkler system should be ready for spring.